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Add graphql-dataloader: Spring GraphQL 2.0 DataLoader batching vs naive N+1, and non-null propagation on a dangling FK

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- naive @SchemaMapping resolver: 6 statements (5 books/5 authors), 21 statements (20 books/5 authors)
- batched @BatchMapping resolver: flat 2 statements in both cases, via DataLoader + .distinct()
- dangling authorId nulls the entire GraphQL response via non-null propagation, byte-identical under both resolver strategies
- 6-test suite over real HTTP against a live embedded Tomcat instance, SQL captured via a JDK dynamic proxy (StatementLoggingDataSource, reused from sdjpa4-demo)
- docs/05: two Boot 4.1 packaging changes hit along the way (DataSourceAutoConfiguration's new package, Jackson 3 by default)
- root README: add row for graphql-dataloader; fix openapi-versioning's placeholder link now that post 7477 is live
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asmhatre
2026-09-17 19:57:41 +00:00
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| [`spring-batch-partitioning/`](spring-batch-partitioning) | [Spring Batch Partitioning and Parallel Steps: Scaling a 10-Million-Row Job](https://ankurm.com/) | the real grid-size sweep at 10M and 300K rows (best speedup 1.42x, on 2 cores), `MultiResourcePartitioner` ignoring gridSize entirely, a rejected partition's `StepExecution` stuck at `STARTING` forever, and Spring Batch 6.0's new `JobOperator#recover` unsticking it |
| [`db-migrations-flyway-liquibase/`](db-migrations-flyway-liquibase) | [Flyway vs Liquibase for Spring Boot 4: Migrations, Rollbacks and Baselines](https://ankurm.com/flyway-vs-liquibase-spring-boot-4-migrations-rollbacks-baselines/) | Flyway Community's `undo` throwing `FlywayRedgateEditionRequiredException` at runtime, a real Liquibase 5.0.3 filename-caching defect that produces a phantom successful run, Liquibase's 10-second default lock-poll rate versus Flyway's near-instant row lock, the FSL license change and its ASF/Keycloak fallout, and what actually happens when both tools are enabled against one database |
| [`db-migrations-expand-contract/`](db-migrations-expand-contract) | [Zero-Downtime Database Migrations: Expand-Contract in Practice with Spring Boot](https://ankurm.com/zero-downtime-database-migrations-expand-contract-spring-boot/) | a real 4-deploy rolling sequence against two live replicas with a load generator proving 99.98% success, H2's `AUTO_SERVER` single-point-of-failure trap, a `NOT NULL` constraint that fails every Stage 4 insert, and `ALTER TABLE` silently dropping a concurrently committed row with no exception thrown |
| [`openapi-versioning/`](openapi-versioning) | [springdoc-openapi with Spring Boot 4.1: Generating, Customising and Versioning Your API Spec](https://ankurm.com/) | springdoc 3.1.1 silently merging same-path, different-version handlers into one `oneOf` operation with an arbitrary `operationId`, a working per-version fix with `GroupedOpenApi` + `OpenApiCustomizer`, and the officially-versioning-supported functional-endpoint path turning out to document only one of two registered versions |
| [`openapi-versioning/`](openapi-versioning) | [springdoc-openapi with Spring Boot 4.1: Generating, Customising and Versioning Your API Spec](https://ankurm.com/springdoc-openapi-spring-boot-4-1-versioning/) | springdoc 3.1.1 silently merging same-path, different-version handlers into one `oneOf` operation with an arbitrary `operationId`, a working per-version fix with `GroupedOpenApi` + `OpenApiCustomizer`, and the officially-versioning-supported functional-endpoint path turning out to document only one of two registered versions |
| [`graphql-dataloader/`](graphql-dataloader) | [Spring GraphQL 2.0: Schema-First APIs, DataLoader Batching and Killing N+1](https://ankurm.com/) | a naive `@SchemaMapping` resolver measured at 21 SQL statements for 20 books versus a `@BatchMapping` resolver's flat 2, a dangling foreign key nulling an entire GraphQL response via non-null propagation identically under both resolver strategies, and two Spring Boot 4.1 packaging changes (`DataSourceAutoConfiguration`'s new package, Jackson 3 by default) hit along the way |
Articles whose text is kept here rather than only on the blog have it under
`<directory>/post/` — `post.md` for the body and `meta.md` for the title, excerpt and